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Keeping track of California's more than 70,000 registered sex offenders can be a daunting task, especially at a time when more offenders are going missing. John Cádiz Klemack rides along with parole agents, to see how they're monitoring sex offenders, for the NBC4 News at 6 p.m. on March 13, 2013. (Published Wednesday, March 13, 2013)

More than 70,000 registered sex offenders live in California, including about 7,000 sex offenders who are required to wear monitoring devices.